. >> out on the campaign trail, president obama and republican presidential challenger, mitt romney, both in new york city today. the president making his case to the united nations. romney still making his case to you and me. >> president obama is urging fellow leaders to take a stand against violence in the muslim world. >> i do believe that it is the obligation of all leaders, in all countries, to speak out forcefully against violence and extremism. >> speaking to the united nations general assembly, president obama condemned the antiislam film sparking protests overseas, but said nothing justifies mindless violence. the president also had a message for iran and its developing nuclear program. >> make no mistake, a nuclear armed iran is not a challenge that can be detained. it will threaten the security of gulf nations and the stability of the global economy. >> after the president's address, he headed across town to speak to former president, bill clinton's gathering of global leader. that's where gop presidential challenger, mitt romney, began his day. joking about the perks of